Simultaneous measurement of thermal conductivity and emissivity of micro/nanomaterials

被引:0
作者
Chen, Jinyu [1 ]
Tang, Jie [1 ]
Liu, Jinhui [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Energy & Power Engn, MIIT Key Lab Thermal Control Elect Equipment, Nanjing 210094, Peoples R China
基金
中国国家自然科学基金;
关键词
Thermal conductivity; Emissivity; Micro/nanomaterials; Simultaneous measurement; TOTAL HEMISPHERICAL EMITTANCE; HEAT; TEMPERATURE; DIFFUSIVITY;
D O I
10.1016/j.expthermflusci.2024.111229
中图分类号
O414.1 [热力学];
学科分类号
摘要
Although thermal conductivity of micro/nano scale material has been readily measured, the high specific surface area leads to non-negligible radiative heat transfer. Here, a method for simultaneous measurement of intrinsic thermal conductivity and emissivity of micro/nano materials was developed and verified. The physical model of this measurement principle consisted of two parallel platinum wires, which serve as both heaters and heat flux meters. Thermal conductivity and emissivity can be derived by comparing the changes in the average temperature rise of the heater and sensor platinum wires before and after attaching the test sample. The thermal conductivity and emissivity of an individual platinum wire were determined to 71.7 W/(m & sdot;K) and 0.14, which are consistent with the reference values. Subsequently, the thermal conductivity and emissivity of the polymer composite fiber were measured to be 1.45 W/(m & sdot;K), 0.73 and 1.87 W/(m & sdot;K), 0.8 at different composite filler concentrations. In principle, this method is applicable for accurately measuring the thermal transport properties of any micro/nano wires using appropriate sensors.
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页数:8
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